UV Index in Williamsburg, United States

Last updated: July 2, 2025

Understanding the UV Index in Williamsburg, United States, is essential for maintaining your skin health and preventing sunburn. In this charming city, where the climate is characterized by hot summers and mild winters, awareness of UV levels can make a significant difference in daily outdoor activities. With peak UV levels reaching as high as 11—particularly around noon—it's crucial for residents and visitors alike to recognize and mitigate the risks associated with sun exposure. By staying informed about the UV Index, you can enjoy Williamsburg's beautiful weather while protecting your skin from harmful UV radiation.

Hourly UV Index in Williamsburg

As the sun rises, the UV Index gradually increases from a low of 1 at 07:00, signaling a relatively mild start to the day. By 10:00, it reaches a moderate 4, but the real intensity kicks in around 11:00, peaking at a staggering 11 by 13:00. This two-hour stretch showcases the sun's strength, making it crucial for sun safety awareness. As the afternoon wanes, the UV Index starts to decline, falling back to 7 by 16:00 and settling at a gentle 3 by 18:00. With this data, remember to protect your skin during those peak hours to enjoy the sunny day safely!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	1	low	45 min
09:00	2	low	45 min
10:00	4	moderate	30 min
11:00	7	high	25 min
12:00	9	very high	15 min
13:00	11	extreme	10 min
14:00	11	extreme	10 min
15:00	10	very high	15 min
16:00	7	high	25 min
17:00	5	moderate	30 min
18:00	3	moderate	30 min
19:00	1	low	45 min

Monthly UV Index Trends in Williamsburg

Throughout the year, UV Index levels fluctuate significantly, with higher risks typically observed from March to August. The high-risk months are especially highlighted in April, May, June, July, and August, where the UV Index reaches extreme levels of 11 and the recommended burn times drop to just 10 minutes. Visitors and residents are strongly advised to take protective measures during these months, such as wearing sunscreen, protective clothing, and seeking shade, particularly during midday hours. As the year progresses towards the fall and winter months, UV exposure decreases, making January and December months of moderate risk, where burn times are longer at 30 minutes. Staying informed about daily UV levels can help ensure safety while enjoying outdoor activities.

Monthly Maximum UV Index for Williamsburg, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Williamsburg. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Williamsburg, based on information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

Compare Williamsburg UV Index with Other United States Cities

The table above highlights how UV exposure in Williamsburg compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Williamsburg's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Chicago UVI	3	4	6	8	9	10	10	9	8	6	4	2
Brooklyn UVI	3	5	6	8	10	10	9	9	8	6	4	2
New York City UVI	3	5	6	8	10	10	9	9	8	6	4	2
Williamsburg	3	6	7	9	11	11	11	10	9	7	5	3
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5